Oscillation generator



April 13 1926. 1,580,536

B. ROSENBAUM OSCILLAT I ON GENERATOR Filed August 26, 1921 Patented Apr.13, 1926.

BRUNO ROSENBAUM, OF BERLIN, GERMANY, ASSIG-NOR TO WESTINGHOUSE ELECTRIC8: MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

OSCILLATION GENERATOR.

Application filed August 26, 1921. Serial No. 495,744.

(GRANTED UNDER THE PRGVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L.,1313.)

To all whom it may concern:

Be it known that I, BRUNO ROSENBAUM, a citizen of Germany, residing at256 Kurfiirstendamm, Berlin WV. 15, Germany, have invented certain newand useful Improvements in Oscillation Generators (for which I havefiled an application in Germany, July 24, 1919; in France March 1 1,1921; and in Great Britain January 10, 1921, the French application nowbeing Patent 534,574 and the British application now being Patent157,928), of which the follow ing is a specification.

For the production of undamped electric oscillations, more especiallyfor the transmission of messages, discharge-tubes are frequentlyemployed, which tubes, for the sake of increasing the working-capacity,are connected in parallel. Experience has shown, however, that, by thisconnection in parallel, the doubled capacity for work that might beexpected cannot be realized and further, that frequently mutuallydisturbing influences between the tubes .so connected make themselvesfelt. The idea of the present invention is based on recognition of thefact that these units, connected in parallel and giving rise tooscillations, cannot in their physical and electrical properties be sosimilar that their co-operation in parallel is directly possible. Theinvention aims at the removal of the difliculty indicated by reducingthe oscillation producing units to de pendence on each other, so thatthey influence each other. Experiments made in connection with theinvention have demonstrated that by its aid constancy and regu larity inthe oscillations produced may be attained.

Vith reference to the accompanying drawings,

Fig. 1 is a circuit diagram illustrating one embodiment of theinvention; and

Fig. 2 is a circuit diagram illustrating a modified form of theinvention.

A constructional example of the invention is represented in Fig. 1 ofthe drawing, in whic 1" denotes discharge-tubes of the known kind withfilaments 7.2, auxiliary elecrtodes g and anodes a. 2) represents thecurrent sources in the oscillatory circuits, 0 the oscillatory-circuitof the say two discharge-tubes, while the heating-battery for thefilaments is not shown.

The influencing of the two dischargetubes is, according to theinvention, effected by connecting the grid-circuit of the one tube withtheoscillatory circuit of the other tube, by means of, for example, aninduction-coil z' and inthis way causing the one tube to be affected bythe oscillations, of the other tube. For the rest, the tubes are, afterthe usual manner, connected in parallel, that is to say the oscillatorycircuitsc act on the same antenna as shown, the same oscillatory circuitor are in any other way coupled with each other, so as to unite theeffects proceeding from each tube.

By this reciprocalinfiuencing action of the discharge-tubes on eachother, security is afforded that both are working with the waves whichare similar and that disturbances will be excluded.

The two oscillatory circuits 0 need not be arranged separate from eachother but they may be united either completely onpartially, as shown inFig. 2, wherein a slngle oscillatory circuit C is common to bothdischarge tubes. i

Having now particularly described and ascertained the nature of my saidinvention, and in what manner the same is to be performed, I declarethat what I claim is 1. In a generator for the production of undampedoscillations, a plurality of electron devices each comprising a cathode,an anode and a control electrode, an anode circuit including a reactanceelement for each of said devices, a control circuit including areactance element for each of said devices, the terminals of said anodecircuits being connected respectively to their associated anodes andcathodes, and the terminals of said control circuits being connectedrespectively to their associated control electrodes and-cathodes, thecontrol circuit of each of said devices being cou led to the anode cir=cuit of another of s'ai devices, the direction of said. couplin beingsuch that the result ing electromotive forces in the control circuitsare in the direction to cause the several electron devices to keep inphase.

2. The method of coordinating the operation of a plurality ofthree-element electron devices in e Inulti-tube oscillator, which con--sists in varying the potential of the control electrode 111 each device111 accordance with variations of current in the wing circuit of anotherof said devices, the direction of said Variations being alike for eachcontrol elec- 10 trode simultaneously.

In testimony whereof I my signature.

BRUNO ROSENBAUM.

